Celebrating the holidays as a member of Congress or Capitol Hill staffer is fraught with rules. But Congress learned this week that members and staffers can say Merry Christmas and go to holiday parties.A Capitol Hill commission lifted a ban on members of the House of Representatives using “incidental holiday greetings” like “Merry Christmas and “Happy Hanukkah” in letters to constituents.Allowing the greetings is "commonsense," especially when considering Congress opens each session with a daily prayer and “In God We ...